1. Foreword Whether the industrial boiler is safe, the most important thing is:
1. Ensure that the boiler water level is normal;
2. Ensure that the boiler pressure is within the rated range. Before using the industrial boiler, first check whether the "boiler water level alarm" is installed. If it is not installed, it cannot be used under any conditions. Otherwise, huge economic losses may be caused, and the responsible person will touch the law.
Second, the classification of industrial boiler water level alarms can be divided into:
1. Floating ball boiler water level alarm
2. Magnetic control boiler water level alarm
3. Electrode boiler water level alarm
4. Unit combination instrument type alarm
Third, the advantages and disadvantages of various types of boiler water level alarms
(1) Advantages of floating ball boiler water level alarm:
1. The alarm is not affected by water quality, suitable for any water quality, and there is no scaling problem.
2. Simple structure.
3. Less affected by water level fluctuations.
shortcoming:
1. The cost is high. The water level controller + water level alarm is generally about 2,000 yuan. If the display on the console and the sound and light alarm part are added, it will cost at least 2,500 yuan.
2. Because this type of alarm is a mechanical displacement motion control, there are phenomena such as friction and stuck.
3. Maintenance is complicated.
4. The mercury switch is easy to be damaged and the maintenance cost is high.
5. The operating pressure is low, and the maximum is generally not greater than 3.8MPa.
(2) Advantages and disadvantages of magnetic control boiler water level alarm:
1. The alarm is not affected by water quality, suitable for any water quality, and there is no scaling problem.
2. Simple structure.
3. Less affected by water level fluctuations.
shortcoming:
1. The cost is high, and a set of boiler water level display control alarm generally costs more than 2,500 yuan.
2. Because this type of alarm is a mechanical displacement motion control, there are phenomena such as friction and stuck.
3. The maintenance is complicated, and it is difficult for the user to maintain it by himself.
4. The reed switch is easy to be damaged and the maintenance cost is high.
5. The operating pressure is low, and the maximum is generally not greater than 3.8MPa.
3. Advantages and disadvantages of electrode boiler water level alarm
advantage:
1. The cost is low, and the complete set is equipped with multi-functional "boiler water level alarm" such as display control alarm chain, and the price is within 1,000 yuan.
2. Simple structure and easy maintenance.
3. Long service life, generally can share the same life with the boiler.
4. Complete functions, with water level display, water level control, high and low water level alarm, limit low water level alarm chain protection, boiler pressure overpressure alarm and its chain, control and other functions in one.
5. Suitable for any pressure boiler, the maximum pressure can reach 30MPa (300Kg).
shortcoming:
1. Affected by water quality, there is a scaling problem.
2. It is greatly affected by the fluctuation of water level.
3. Vulnerable to external interference.
4. User selection According to different situations of various users, the above three boiler water level alarms have their own advantages and disadvantages. For high-pressure boilers, only electrode-type boiler water level alarms can be used, because it is especially suitable for high-pressure boilers. For small and medium-sized enterprises, it should be preferred, float type boiler water level alarm and electrode type boiler water level alarm, for the shortcomings of electrode type boiler water level alarm:
1. Affected by water quality, there is a scaling problem.
2. It is greatly affected by the fluctuation of water level.
3. Vulnerable to external interference. At present, Tianjin Security Boiler Instrument Factory has successfully developed a new type of multi-function boiler water level alarm, which effectively overcomes the above shortcomings.
1. For the problem of scaling due to the influence of water quality. The plant adopts pulsating exchange nonlinear asymmetric signal voltage, low current, and conduction current at the microamp level (10μA), which has effectively overcome the scaling phenomenon caused by water quality problems.
2. For the problem that is greatly affected by the water level. The factory adopts the current relatively advanced anti-interference technology, implements intelligent filtering technology, effectively prevents the interference source from entering the system, and truly solves all kinds of interference problems.
3. The problem of being easily disturbed by the outside world, especially the problem of being easily disturbed by the frequency converter, is the most difficult problem to solve for this type of instrument. On this issue, after hundreds of experiments, the factory finally launched a "UDZ-141X-G multifunctional boiler water level display and control alarm" this year. The advent of the alarm has effectively solved the problem of external interference. This type of instrument adopts the follow-up tracking technology. When there is no interference signal, the system is in an alert state, when a weak interference signal appears, the system is in a filtering state, and when a strong interference signal appears, the system is in a blocking state. This enables interference-free operation.
